Typewriter paper feed mechanism



Jan. 12, 1932. GARBELL 15841,].16

TYPEWRITER PAPER FEED MECHANISM Filed March 20. 1929 2 Sheets-Shout l.JZJ//ZZE flax GARBELL.

Jan. 12, 1932. GARBELL 1,841,116

TYPEWRITER PAPER FEED MECHANISM FilGd March 20, 1929 2 Sheets-Sheet 2- Ha" Q Patented Jan. 12, 1932 UNITED STATES PATENT OFFICE MAX GARBELL, OFCHICAGO, ILLINOIS, ASSIGNOR TO VICTOR ADDING MACHINE COMPANY, OFCHICAGO, ILLINOIS, A CORPORATION OF ILLHOIB TYIEWRITER PAPER FEEDMECHANISM Application filed March 20, 1929, Serial No. 348,415.

My invention relates to new and useful improvements in paper feedmechamsmsand particularly to the paper feed mechanisms used ontypewriters. The form of paper feed mechanism heretofore used iscomplisated and expensive to make. My improved form results 'inincreased efliciency and greater economy in manufacture. My inventlonwill be more fully explained by reference to the accompanying drawings,wherein:

Figure 1 is a sectional, side elevatlonal, view of the feed mechanismand of that part of the typewriter to which it pertains;

Fig. 2 is an enlarged side e evational view )f the feed mechanism;

Fig. 3 is a perspective view of the feed nechanism;

Fig. 4 is a detailed view of the carriage rail Fig. 5 is a top plan viewof a portion of ;he feed mechanism as it appears mounted .n connectionwith the platen and feed rolls )f a typewriter; and

Fig. 6 is a side elevational view of the teed mechanism, feed rolls, andplaten.

Referring now more particularly to the lrawings, feed rolls 10 and 11are shown )iased against a platen 12 by a sprmg 13 which actuatesbracket arms 14 and 15. Bracket arm 14 is pivoted on the flange 16 of;he carriage rail 18, while bracket arm 15 s )ivoted on the flange 17 ofsaid carriage ra1l L8. The flanges 16 and 17 of the carriage an 18travel along a raceway comprising ixed rails 19 and 20 attached to thecarriage ruck 21. The balls 22 and 23 separate the ixed rails 19 and 20from the flanges 16 and .7 of the carriage rail 18. Separators 24 md 25position the balls 22 and 23 longitudirally of the carriage rail. rockshaft 26 s attached to a cam 27, said cam having a flat 58 which engagesthe lower arms 29 and 30 if the bracket arms 14: and 15 when the rockhaft 26 is moved to depress the portions 29 .nd 30 of the bracket arms14 and 15, therey releasing the feed rolls lO-and 11 from ontact withthe platen 12.

The carriage rail 18 is formed of a single iece of steel, the portion 31thereof depending at right angles therefrom and forming a bearing or therock shaft 26.

Indentations 32 and 33 in the bracket arms 14 and 15 determine the pointwhere said bracket arms are pivoted on the flanges 16 and 17 of thecarriage rail 18. The carriage rail 18 is cut back at points 34 and 35so as to permit unimpeded downward motion of the bracket arms when thecam 27 is in its engaged position.

The spring 13 is attached to flanges 36 and 37 respectively of thebracket arms 14 and 15 and these flanges are located between the pointof contact of the feed rolls 10 and 11 with the platen 12 and the pointof contact of the flanges 16 and 17 with the indentations 32 and 33 inthe bracket arms 14 and 15. This spring 13 is only slightly displacedfrom a vertical plane passing through the points where the bracket armsare pivoted on the flanges of the carriage rail.

A lever 37 actuates the rock shaft 26 to thereby move the cam 27 toforce the rolls away from the paper around the platen. Apertures 40 inthe paper apron 39 permit the feed rolls 10 and 11 to engage with theplaten 12.

My copending applications, Serial Nos. 239,015 and 239,821 illustrate atypewriting machine in which the above described paper feed rollmechanism may be advantageously employed.

When paper is to be fed into the typewriter, it is inserted between thepaper apron 39 and the platen 12, the feed rolls 10 and 11 being thenspaced away. hen it is desired to release the pressure of the feed rollsin order to adjust the position of the paper, said feed rolls are movedaway from the platen by pushing the lever 37 toward said platen therebycausing the flat of the cam 27 to depress the lower arms 29 and 30 ofthe bracket arms 14 and 15, and to hold said bracket arms in saiddepressed position, said bracket arms being pivoted on the carriagerails 16 and 17 so that the feed rolls 10 and 11 are in spaced relationfrom the platen 12. lVhen it is desired again to restore tension of thefeed rolls 10 and 11 against the platen 12, the lever 37 is movedbackwardly from the platen so that the flat of the cam 27 is disengedfrom the lower arms 29 and 30 of the Efackets 14 and 15.

One object of'my invention is to reduce the number of parts in t ewriterpaper feed mechanisms thereby ac loving simplicity and economy. Anotherobject of my invention is to simplify the superstructure of said feedingmechanisms and to insure that there'are no exposed parts in whichmaterial may become caught or entangled.

As will be observed from the above description of my invention, theactuating means for moving said feed rolls away from the platen areseated or contained between the two carriage rails. The cam 27 contactswith the lower portions of the roll-carrying which brackets or arms 14and 15 in said rail enclosed space so that the possibility of nonoration of the said roll disengaged means tlifough the intervention offoreign material is eliminated.

Moreover, the above described feed roll .control mechanism is verysimple in operation and comprises a 11111111111111]. number of withoutbolts or other securing means. In

connection with this elimination of superfluous parts, attention isspecifically directed to the manner in which the rock shaft 26isjournaled in the'portions 31 dependin from the rail 18, as well as theway in which the brackets are pivotally secured to the upper carriagerail. 7

While I have described but a single embodiment of my invention, it willbe apparent to those skilled in the art thatthere may be manymodifications therein without de-. 'parting from the spirit and cope ofthis invention, and I desire therefo e, that the same 1 be limited onlyby the scope of the appended claims and the prior art.

Iclaim: 1. In a paper feeding device, a platen, a

supportingstructure therefor, feed rolls co--, operative with saidplaten, bracket arms sup'-' orting said feed rolls, fulcrums for saidracket arms constituted by .the edges of a slot in said supportingstructure, and tension means common to said bracket arms, said tensionmeans biasing said feed rolls against said platen and biasing saidbracket arms against said fulcrums.

- rail, and means for urging said arms are so arranged that they may be"mounted in operative relation to the rails the respective en ported bsaid truck above the same and i1 spaced re ation thereto,journal meansforme inte ally with said carriage rail and de pen ing therefrom intothe space betweei said truckand rail, and a paper-feed-rol release shaftlocated in said space and jour naled in said journal means.

4. A carria e rail having an aperturl therein with e ges adapted toconstitute ful crums for paper-feed-roll supporting brack ets andcomprising an integral portio1 adapted to constitute a journal for apaper feed-roll release shaft and formed by mate rial struck out in partfrom said aperture 5 In a device for feeding paper around typewriterplaten, a carria e rail supporting said platen, paper-feed-rol s, armson whic] saidrolls are supported, said arms being piv otally mounted onthe edges of a slot in sail ams the pivots constituted by the edges 0sail s 0t.

6. A paper-feed roll bracket'comprising 1 substantially horizontallyextendin portion a roll-supporting arm extending Irom on end of saidfirst-mentioned portion, a spring attaching lug at said end of saidfirst mentioned portion, spaced projecting por tions at the other end ofsaid first-mentione4 portion to form a notch for pivotally sup portingthe bracket, a portion dependin; from said other end of saidfirst-mentione portion, and a cam-en a ing portion extend ingsubstantially par le to and in the direc tion of said first-mentionedportion from th bottom of said dependin portion.

7. In a typewriter or t e like, in combina tion, a movable carriage railhaving a slo extending transversely, thereof a pair 0 paper -feed-rollsupporting brac ets' extend ing through said slotal'i'd each having anote] formed in an ed ethereof to bear agains of said slot, aspring coacting between said brackets and pressing the notched portions thereofagainst the ends of said slot whereby said ends constitute fulcrums forsaid brackets, and a cam for i movin said brackets apart against theforce of sai spring, said brackets having juxtaposed portions engageableby said cam.

In witness whereof, I have hereunto sub scribed my name. MAX GARBELL.

